Method of manufacturing cutlery.



unnrnn STATES PATENT OFFICE.

ERNST HAMMESFAHR, OF SOLINGEN, 'NEAR'FOOHE, GERMANY.

' METHOD OF MANUFACTURING CUTLERY.

Specification of Letters Patent..-

Patented Mai-ch20, 1906.

out the finished article, at the same time securing greater uniformity of qualities and increased density throughout the article.

1 The articles to be-formed are first roughly blanked out by ordinary forging. Then the prepared blank is again forged out, giving roughly the outlines of the article, and the necessary drawing or squeezing out of metal is practically completed. .In the next forgshould be.

ing the finished article is produced almost in its proper dimensions, but with a wide fin of superfluous metal. These forgings are done with the blanks at usual forging heat. The

"next operation consists in removing the hammef-scaleerforge-scale. This is effected by subjecting the pieces to the abradingaction of sharp sand or'similar material in a revolving drum or by the known pickling process in the acid-bath. Next the fin along the cutting edge or edges of the article is cut off.

It is not disturbed as yet along the remain-' ing parts of the tool, such as the back of the blade or the tang. The reason is that it is intended to subject the piece to one coldforging between the hot-forgings and then to another forging action, which is to be more of the nature of mere polishing than of forging or changing of shape in any way. During the cold-forging the blade proper will draw to some extent, and by'cutting away the fin along the cutting edge only theflow of metal will be in that direction, which is as it The cleansed pieces are now placed cold between highly-polished swages suitably shaped to'bring out sharply all the contour of the finished article and there subjected to a cold-forging, the object of which is mainly to remove any irregularities remaining over from the hot-forging or which may have been brought out by removing the hammer scale, as would be the case if particles of scale had lodged in minute pockets, preventing uniformity of forging ac= tion. Now the entire fin is cut away. The piece is practically complete as to shape. The bur produced in cutting off thefin is next removed by again passing the piece through the abradingaction of sand or emery in the revolving drum or equivalent means. The surfaces are next smoothed off and given a partial polish by again cold-forging them between highly-polished swa es. This last action leaves the tool ready or tempering and the finishing-polish without any preceding grindin It is to be noted that the successive Iorgings improve the quality of material, as well as the appearance of the surface. Having now described my invention, what I claim, and desire to secure by Letters Patent, is

1. The method of finishing cutlery Wl'tlk' out grinding, which consists in producing a keen edge by cold-swaging and then hardening and polishing. 2. The method of finishing cutlery without grinding, which consists in reducing the work-pieces by successive steps to the general form of the desired product, producing a keen edge by cold-swaging in highly-finished steel swages, and then hardening and polish- 1n Y 3. The method of working rough cutleryblades, consisting in removing the scale from.

the rough blades; removing the excess of material at the cutting edge of the same; swaging them in a cold state in steel swages, removing the fin produced by said 'swaging re moving the bur resulting from removing said fin; swaging'the thus-treated work-pieces in highly-polished steel swages; and hardening and polishing them, substantially as, and for the purpose described.

In witness whereof I have hereunto set my hand in presence of two witnesses.

' j ERNST HAMMESFAHR.

Witnesses:

ERNST KATZ, ANTON APEMAOHER. 

